***BREAKING . . .
MCCASKILL ENDORSES OBAMA
It's now official.
Sen. Claire McCaskill will endorse Barack Obama for president Sunday at 9:30 a.m. during a press conference call with reporters.
Although McCaskill seemed to signal she might stay out of the primary fight, the endorsement is not a surprise. Obama campaigned for McCaskill in St. Louis during her 2006 Senate race, and since her election the two have co-sponsored several pieces of legislation together.